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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1867c04c9e2d99cfd4d0ae7abcf29b07f865f2ac6847ede4089bf6e1ecc11b3f' 
  AND token = 'PsXB1OWtCa1Wzh2fKqD95WTZcW1+5TwlGNTgbqkMdzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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