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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e0f19ed53da7df4c02d4fd20a0a0fb30581c9995572dc02a5b770b97f2782b2' 
  AND token = '1R1yDptifmsaHb3rXR7jSHyCXG6h3tPSQ8RbVcKJd2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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