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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fedc047e24e10c00beb9068051fad4367f975f4354934f39e42ad026e62e6dc' 
  AND token = 'zMnBFa/2KsNffZUgmmnvEczPqce7yErFR9idKOOsisM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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