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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34cdd4158e531e2e457d7d4a25d9b82f61565eaf679c4894e1cec0ebad9dcbc' 
  AND token = 'fDSyyilAiai7lCELdZX20VFmLqARILQTsnIQt1wvJFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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