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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcaaa0b235bf65f5ee3ed5dd65d94816e2a29750278871ba7d4d27c63e214e4' 
  AND token = '6lwILCrLqmnTyqQyAYygTtoSarerYx8Hn5o40CrpYaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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