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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fa95fd4257fbb730ec3d3446a2ec3d63555799ce0dfb56f7c53e650fdd54d9d' 
  AND token = 's6yQIY7RPZ5RFz8sm3jaAjRbwYJ0G4Sk6pEkiE6OgOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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