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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77d5fc23b4f6be2ea0263fee6a7febe2c045e48d5ca03b69bf9d6588fe2d6117' 
  AND token = 'b7DYUVm1xn0XeL0IGaTAQO3cIj9ZtlX6WvAYXfFzwTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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