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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98cbd4b6c21a15cdeeb267074a1e23bcff1035b5048f081c0c064cfc9b0b5c9e' 
  AND token = '3ShpmX9iNsqD7lUsOnpQL4fqtuQfu7h9pfaXFZwdGY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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