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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4aa61a5ae67a8bbad41e02db1581267f2b286f1884e3aff02ccbc81b86a4876' 
  AND token = 'BILDRuyHFAkR04D1Uvj08zBbcwSIQXZ+GU+veQcho+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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