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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edf7c963e34b596dfcdf33d29cc8a46f58bc51f0b9a5ea7c0ea51e33a0132ac' 
  AND token = '/dgbstAKlcEQyR/Ez6Tlen/A2bO6Ms/Tlt2m6annHrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}