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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240c2943fa91b449950cfa4e23efb90a849238ec8155d24b709be63330797587' 
  AND token = '8n3PvOEulWTkP70M7vu/uDfc8uSpHlCXtqBL4C6ZV/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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