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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d1667e142d99216793f0140c83c0753c024a6ed4cd613051c117aa03c6afb6d' 
  AND token = 'EcFMwrhHFW5mDivDulkDE6BjrcIFgcjzbLDk4hxNXN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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