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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6e8f4e0e6e02b46d5a63bb56cc05ae955436b796bdc082a9911cad320313805' 
  AND token = '8yYK1p1sGtBLJo6xbKaE7x35TndxBL3bM6R9yznGEPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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