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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e2e901f8ce81c4b5403985182035c518d0e8ec95caf99b06c4c7048c55fe0c' 
  AND token = '8r6k5a+NinH2DLBpxR3cmKHWL14AR2pbGCub6O55ie0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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