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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be9657c31ca31a64e1013caf7d89b99789b96e1204786e8ede86be292c09e23' 
  AND token = 'J2UHfOXArHfO8UauvJ/fJDeb9C46OsjyoSk8U7pe0jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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