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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b50d708f8e75b39a2ac4b2046cb37feec59cbc5970fc48a72d53866cd3b0a85' 
  AND token = 'fRgMTcGxzGuw47JFMPdeV+VNoxD7bOfbFHtRY9C/igo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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