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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8de479bf2572f25749d8196d5089a6394148868e4000fb6d2ed8c4138a96ca7' 
  AND token = 'Yrbxjb/Oq5K1FczDaQkRq+LxQ8mM/aR5snUylGaEKss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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