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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '031fce9ce48ce47d29f9e71bb874736d6943aaa393f4626a323264fecbaf156c' 
  AND token = 'OjDkLOokbva+CvDUDPUHkBCQsi81M311TOAt7Db9WEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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