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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e38e1b1f41cbe04d032c15dbd57416d4d0dab9f9c5fe2570584caad2cd0eec1b' 
  AND token = 'YH0FkUz0xnhY5CrB3TdW/swP/V1uu0DJtNy8aM3favs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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