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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b4d9117d8b4b26b008d464217a8534ebd6280acfc9b3076cca4806002b3669' 
  AND token = 'dYABUTUQuwS4fHKrNRjIVjp1TEzPfimI8RISyi+qWTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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