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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a474ee9b4332b44b435c3d8429abf59d1e2a72e5561af80724e721695813830' 
  AND token = 'H745Vvd6FXd55dxBUx9FqDeK5P1X5BbmDTs/5l2lZQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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