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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c100b24fc61cfbe4caad731418ba9f449d8160ab5667aacc33725212423c070' 
  AND token = 'HrsVUZLbtIzU+/TT3vEBxi6YK2S5bLp0H8ZD6V3TwFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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