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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2c614358cd425acfe1dfb81b1f8672caa4403ef405fb7268448e5255f806d63' 
  AND token = 'tuLZHDl5LZJE+0PJfT6fC9jbXMQCI5+5C9TZbGgrSSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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