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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19131637882602b8945afdce0a76d06b09c3132eda461a98cd7c623d360feaf2' 
  AND token = 'G4gHPKGTYOL05C/i2B9KPGl7Q6no6bE9+WiDhNWrtJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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