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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded6712688ba8efb4f106b22b0a8747b5f8e03f161718d8e8b4f8cb234314838' 
  AND token = 'rLaeNjC64UJy4FPNQH1zN2M2Pn6SPlko7f+iCKJS3oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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