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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ecbac462365850f525b2b75bb7cad09fa0757c3a4e73449146dd2daef9281b' 
  AND token = 'b74NetEar2z7mZLBA+jUZi2ruT33u26/rdDCcNQN+zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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