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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4117536674fa38640b8a6f0d93b7104516d9b5d874e581c0dc6ee9043fd0cd' 
  AND token = '6wDpeh2AddP8MEO13oVfxJru/YCUts6DqBR8YA5lLVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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