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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48f9071beefc0e8bde94b23e24571089fb330c9928c70e03b0ff926a2601654' 
  AND token = 'SmY5stVmy9v8hLPiP35+Xj2fPafwx7wvUO4INsQFIKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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