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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0e37bf63b71a3560ce9b611e21a14b41716912930780221955878c7d3bf118' 
  AND token = 'w3rKMT7WphIi+aIZVm9I7I5LM4Jk2RatQcTeJuyterE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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