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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd7ff393c904f13e0e6755f9292de84e12104eedee2b159bd31ec1e61ce5891' 
  AND token = 'OHwDAH65Cfq3tW/Vo7Yb+EDNQ6rztJjdisIWQOvxB6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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