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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f6e7215aa245d0d70c380140d1eacf3f3d8dc54d62893738249bc900aea5e20' 
  AND token = 'dglADGs6tNOEc5Z4AL8Et6/rNtVv3v3qIurEC8t2j7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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