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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf4e39558a1a7ac7cba312445e4496466de322f3d8e05357539506275bddd950' 
  AND token = '0NlU6hHqmkbMrR83MGd637XcDqHSnhTsBrr6G0Z3ET0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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