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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827b393cfda2afc7cd3c606dd96d3ebd2a562252d99001b0e830308f093cfba2' 
  AND token = '/ywLbwdFYvHIxzjuxu+jkytwfCbrJznAatPbMv7QNwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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