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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55672ff66088a7093083e0a6c7cb51f7230947cade4933087ae29d6f991834fd' 
  AND token = '31oMbIveziaeuKQsjfCioj7+Nk3A64kmzA7ZAZIL2gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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