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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9014644374093a319cc8ea414492cde66303ce80239f5232fa704d69edd260' 
  AND token = 'SMrEur9Lohm7Kcl8zu9bS/btxNdA0KtyWP6UrZwP83k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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