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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd3dd426cbf8ef7660569d5842aef43c36aed64e1d2388268ffd68726aa1d14' 
  AND token = 'He6VUJgF1yveBSpjvs3yy+s8ZibFY48muLLF+KJsZYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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