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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2c3ef2d693a70d7c627031894ca6af2057149834521dc40a9cca0eb4ff9ca0' 
  AND token = 'kkPSHeM4g+T6HqTyRcVP+ril+ZwdHMKLLl2NU/EXYIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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