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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4471524484e634b3c2a7722848b3ab6e32e5e10a573330938e66b71de2f2815' 
  AND token = 'ZCaiqWsURI7gUD9gmwV7r04YrN9XOQA3Y8KZP1GMKp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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