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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492a902fef36f433e2fd2b2273edc5c01b84f90163e2ae389506f1058fc2731c' 
  AND token = 'vQQjA3rLOqTuMNkvj+2OJRILQEb0DZnkRZ1/P2e0Xkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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