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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9656f85bdeaaaca61d4d8aac9ac1d18c6beefba19d73a3011c1904d08a07c7c9' 
  AND token = 'Z0skqZiAc+61K9cVhXbBdAuFPyiX4ksWtEklotfvSt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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