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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b5a9d004fdb8414f99044f090374d7e6d36b458eb8ad037afed9a9fe125c83d' 
  AND token = 'i6I3OvabfNJnZXFEYhlejQ4oeGD+skSj52KXBpTcvI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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