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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c76479557d4016ef497baa79ca9afe8575a91294e2fbdcfba721c84f0c0b34' 
  AND token = 'M6GLA0Bp5D1FBQUM0npstetp9rQLKU2RFn+Be5XQv00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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