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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230aa7ea1464e3cf2a807a2a581125c6571b986f6e34908c7e74dedf54c0fcbb' 
  AND token = 'zKoj0/b4s74fyajj6VKAYHIQgrX8KlnbxHHn+1DCHr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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