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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0b90c58d8ef587d6dae828abc2291ce10bd025e6644ccb70775b2b1ecf7b5e' 
  AND token = '+i3yYYUnQyLqs5bCq0v1I1GtBe8R/uBvDDDxng3FqvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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