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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d609cd63eaf066b3b926b3d2baf2efe1d11824b6124f0180747a4520a3a31fc' 
  AND token = 'iKVxc070yeZT3tkaYC0MNgIfXoYqLNnIb/KMl5mXYBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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