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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a54acb92ad770e8bcc73735875e2155e883e0d9d6a364f8877e801695447ce' 
  AND token = 'eSd66q6YRSDr4Ud4vsbrqwdGuRXvNAFkntU72F0lqBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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