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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0976e604ac75fe9fe85134f5ba6c6a470ba8a80dffa8fba7810a8aa2d9b09c7a' 
  AND token = 'G1SZjbNsnT5z3ggGeFg9s+JZ9n3eWVd2WAD6xkM0FaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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