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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93c283a6e9da24d068ba6fc11e71b5f8fafe989a8f37d074bd76a15f2ce0fad' 
  AND token = 'fbbUHsL4VvY54uyygpv9kSpFM+cDRSicI2KfMjkLukY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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