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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d24eaee73a7fb6d6e870bad60fa6046974d857b6ae0c3ff117ea9edcb866101' 
  AND token = 'BV/AC6Q1h7jjcuUSn78uUb+x2wj5snzdJxyDa9ypjgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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