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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47df2123ea629a355d2a52a11ae88eea65862911b7ce6d67d93f6b657eb02f16' 
  AND token = 'iYFsIxBoenmnO0FTSgfTS2LG3SXdA7Jue7ur1PNNjJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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