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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2026e20dc8e5649106755f599cf5e3f318eec9e5038ecde109438b05ff4988e3' 
  AND token = 'OJ3AzyBuscS3SnsUvci0HS/36obrGpgffLWhybd1I1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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