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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '718238a7997a90c53698876c8875b264901b56de4a363cc838d501ffb710a34c' 
  AND token = 'Qh8RxZhhevoKsLsk8qJLGDN5Hfo3+EWQee6ooAyzOJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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