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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee87593fb55f333b542614b368b1a6650eac0614e5f6ea010265e919be3f5309' 
  AND token = '4kP3DbN8fvxKW66xcN02OtwkS0MhTYXawh+Ko9NdK2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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