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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938a19f0125c6f2d6fb9c0ff001d92cc709cbc9ebebd474ef2bdc01a8af6fb94' 
  AND token = '0vXmT2y43psEv6mA74fHANfAgkufqRawHcq25CoTsYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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