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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18d8fd401830993d720e7fd32a812bd54dac154d3ce96f715078c75e1bbd74c' 
  AND token = 'N6ZCMT09PWySrjmdGlKho4Vqz9DloEqGLriSRI2P2p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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