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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd324dc6fd3050c3d79c1f6f9f371d9b6cc7f87d3a4dbe779114716ffd7b21a' 
  AND token = '0Xc2B1m5/nWenAtyp+u7l7ey83QZ21laZqunaOd0kAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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