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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79658f93121dfbcd98af2cf168ccc5e8489d8383e45e63b0bca128b5e26dd080' 
  AND token = 'mJ9m69Bb8SkJZb1x4wdqY0ni7rwCRJLyCuCLdcL4LGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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