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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15b2a0ce5a815d61b881be24a0bfa47a42340edcaab32790974a5f08178977f' 
  AND token = 'xk6RJzctmY02REDa87x8l22OT6UIFzuWNf+Osp18cI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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