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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffedc22c17634f75b9958cab9ea2dc7c30c9798a38e6a1d1fca1248f0e2a93d' 
  AND token = 'h/LgzPpPk1LnzPV0p2M+Nzy05XC182V5Rvfb17d41Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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