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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6e724e3a0bbcc14d19e81de41abd02ee2f2e935d3ef2abf4ac794bf99b9fd9' 
  AND token = 'Cpdert6DUoNvEsTdWYtTzdxKL8bt/wjXStcgf331VHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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