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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db6dddd5f2d6dde4ef9cc785acd3cacf8f164bb625048fd8b0cb9b368cba209' 
  AND token = 't5vCfgpXUsEt6CBrE5ScLih6cOjUKMiaon0U0Sqj8a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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