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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '021f05ae125158226d9bced8ddcb31fb0a1d292a79073a07dd3851deb19aa627' 
  AND token = 'fpjxqj3AIIsPXt6Cxk2WuGVrtNqIcVb+eaNv3uj1vSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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