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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd9165dac1445d3f88ae47ef5cb090402d0fd36ed5c8c1dae3d3fa681002c2b' 
  AND token = '+hEFGR79fXDHWBZ+pSoLB26OTw4btdKiTXaZn2JXyZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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