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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2b56728b9c6cc18e7cc1260127c57f24d9f83bce13310abfc40ff35bfc8d1d' 
  AND token = 'dXphy1HCwm1H9hrvbpRGH9v2m0y9J7//D/av2qT1sG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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