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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3e1905329f500db23becdb6f44f1eae1e97b168ef28300cbaea43784256030' 
  AND token = 'z2N6CKOqMUSExF8Qbjo0E187CJWSYDs63C9TpQumEe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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