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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868f91bb9b95c40477067011b1b6699db64b3b6c53dd6d3e299185e1a95e8bc2' 
  AND token = 'h6Tdgv3gh1oG802ZGcbpXnPPuVdOKxFiY2E8nToedUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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