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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e5626b07baba8c1914103ef381e2cddc698f1768748264f512920179be20fd' 
  AND token = '0kyeIUsd8IUfId40shQt9wnVFgyTBqHL5u2ZD9J8TUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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