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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bdb0563666fa79358a6bc17e0b3d559ea80056f73477e7286ab4bb267deb764' 
  AND token = '3eBw70MtY9dbsGdNbq6EgS+AjK0/NTf0ykOfeuQri0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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