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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534fb64b1f74576abb1fd48f73eb7a6591fa19e0ab87a3fbfd782e0b4a2cff15' 
  AND token = 'vPPR0Wf/Uave5rU/m8+67hIdzgofh47ZNwsRuZCecuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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